Infra-red radiometer



FIG. 1 is a right side elevational view of an infra-red radiometer showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an infra-red radiometer, as shown. 